Thank you for your question! Rheumatoid arthritis should have no affect on the outcome of a PRP treatment! PRP is often coupled with microneedling. Microneedling is a great option for scars, though typically multiple treatments are needed. Microneedling, also called collagen induction therapy, is a minimally invasive skin-rejuvenation procedure that involves the use of a device that contains fine needles. The needles are used to puncture the skin to create a controlled skin injury. Each puncture creates a channel that triggers the body to fill these microscopic wounds by producing new collagen and elastin. Through this process there is improvement in skin texture and firmness, as well as reduction in scars, pore size, and stretch marks. I would recommend a consultation with a provider in your area to better assess the scars in person as well!